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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55738b62ef59f09b866e3ec14a5042993d8c3265f57aed10d7d12ec9d1f83652' 
  AND token = '0HHrPlkpXcCJ64ffDEqPtRBSrbCIaELu0iCmIpqqwBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}