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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48eca6a7bb96c648abd8f85d6176c6961e221a9b7515731e0b948b5ba8a5410' 
  AND token = 'C17kPyIVV52nZmKU/PkcmKGp0657ZXp6prY3hKKIdio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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