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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09be1322acf60d0a296b17500f5ef99ff06feba70a54f3eb88608fb156e0f9b4' 
  AND token = 'XzK/30EPwHfMX9Od3HR6CtekL+V+sCw07zLNdG8VweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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