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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edfb058be102f6578499c53e46f667553554283fd24fb96951056f0f7343bb8e' 
  AND token = 'QFeXlrmpd8UxdkcbClyTzQ+4rm0GkhzmLP1itvj1zIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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