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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f30d2cc79ccb09ff187887bcfaa9bf197250bc487de02b10f807914b3d30d57' 
  AND token = 'OLMmGKX/6zivGlZE1tqlD+h0fhvsJ85tKfVN28kso2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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