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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c84ff8c92a60dfc561e6d7e78f0d27c73af46ccfdfacb9cc342402709a7c93f' 
  AND token = '88fjwRyQLSsZ5g5fGaOOdqRQbIc+akyqjMLif+xN8A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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