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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0275606dfc2687d080bda22a403dd038933dc3b6393c49b1f298f07e267fc53' 
  AND token = 'Vj0BISpud5K71ziir5kGktampWdw0LJmhlLCsmi86qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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