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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ca58963028d901ac5dd0decd69acd69f7ad39995d79814285b40565ac37128' 
  AND token = '9tN1LoZCSHbiTzdBaKCu0x6o4ngNn2TK+w9+CVhIgdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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