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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6623e51a192749549c004f09d4ed7c90f76498ba6a772cd5acf756e648ce8753' 
  AND token = 'hYTz1aZ18Y7oWm+Wx1X4VW84iJXCU8Njk5GJOdWX23w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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