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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17531f9c61ea96b793611253fd69c617c15919ce0e9d5b27b43ced971fb57cf7' 
  AND token = 'EnuoboQS/XSgYc/FchCNmGFSnQ6RNCaiqJzjO/eAayE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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