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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c2e1889b9bdfd130692d8bfbb32e8d157de937b7ed9dfb444217f23f6f3508' 
  AND token = 'cDNYNTH8EhlX8v7Fk+kSnXFTdGj1OhByq1T01J7SaT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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