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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a456dad3951ae0b164ec34f7f20a3de6059dcb4069a92401f69fbc500f8955a9' 
  AND token = 'zPOK/y638cPe+b697tlG1a2WHs8Ztbsg6SG6tIAVqQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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