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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2014c5f17ebcff35ac141d572281fd491c75aa08c9e90c5779b365c790cefbe2' 
  AND token = 'AIMhT6fMvP6mJzkF2p54hHhbX5uaN8fvmvasVYVn1hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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