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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d8c87c47bb1a626b5fafd38e8b586e3064b0fa4b38dd9a73e5504d2b82c8f9' 
  AND token = '7SOspCKgsI6Pfyk6ufmZkdpESFMpisM6R6vgqtd0Xn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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