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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929a66d94d02cffd85057e3ae6be54860adba70de90a26f7f95dcb906d038ac4' 
  AND token = '0x5Ff095kgf9d/LP50Z5e/grYznurE07eJrYyXCigLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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