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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c80c395b4dc3feb62aa557c4646102f275d96ca09dba2e3009ba2b98569708' 
  AND token = 'X1UYw3SHbiqN4+8nYRaRp6ekrYS+0J5PG99K8QhY1kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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