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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0b183a2f15264868c0b0aa2bb97897c284fd53999e39717feeb36b65ff9fef' 
  AND token = 'i1frOqDIFiwWifPuE65a/moHOuZ8ZM3cw4u5Eo4xtjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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