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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf84676f1494d60dc1d3e4521aecb4e11cd851a4921e3c2192b713ea504a133c' 
  AND token = 'D+4El3T2st1sI6HkUndrJdifzyvwozF+x9TZREQMCaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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