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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd960024934824c5a834cfa3b725cc5f3a3e7b7c17b129c74c591aa434bf31e8f' 
  AND token = 'GL7sMmj4aRNJzo8h8Sr+Oijtc38Spp945osKktD2lPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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