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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6ba65bd6296e07ce5c094654411c951df71f3d5ddec41eeb667d4710ea33e7' 
  AND token = '9xgUtaWPeftnSF2RK3rnZbB8GNVK+8cj/fjlrK8Ni0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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