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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964a312a0629cab353d5a94516706c8523ac29c8cf6e3bd93a0359d5269c7df5' 
  AND token = 'D0z80jWlIUdZqCOntGt+0ElklRCZZD2gFOBa/yOHn34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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