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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcedcd7bf7599f340fe08da081948a7cc24577c5b24a293891e9f2ad9f81e3f' 
  AND token = '64Qwx3z4rhmgi84b9KQ25L7kDEg7CQwa0rRSUAZIZzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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