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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab9ec090dcbc90a227a035ec4626ad24ad870ba039a65eea8bef60dad352671' 
  AND token = 'sHBO4hurr5J0Gu/brcJud/SUdNdL/n+eeBDgeuolIko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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