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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c435ce5b8d6257f6c2534d4b1753d825c5402ed6d765f2c3178cfd16b61287' 
  AND token = 'bfIMUec22TPgTl/GJRK1iEbx+0nyZNUFhSTVn5SVCOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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