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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddecb165ae86eaf7e865762d2d15b520715c5d9ad76e4a528c56c8754838fcbb' 
  AND token = '5XLoCk6EI4xw3N4o6Zd4tksakx78E+Y8Eg0BJojr6Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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