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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9255673bac4428955f655aad7c45520752061f8f395ae197a6dd70a8332f9db' 
  AND token = 'KlsjcPgTMlvIfpHpMUT8x/Hi5r210HF3xNBy/Rk7wBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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