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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a682e886eef70b5dfb9bdaaebabf10a6a8208416ebd1228b579cd1f7bc8d26f6' 
  AND token = 'Si7EjB06R8rHWwmBAdl6c+AHOwihKMdhUTPR19RXO/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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