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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26558e62f9d924147b3c4a65f464bef92b9809b756c4ac0c07c0805b49a01b51' 
  AND token = 'Cah1hukNinCJF7luQEgIXw9AP1WERh5x/NnnXtujQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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