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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e737180fbc14bc5bbe49154c52dbf77f7f9369457eef6953416d3e14a684b3a' 
  AND token = 'EyTI0OckDDUoEjLJVdZG1TiKWHqqW0TwEA3LC6N1C7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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