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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16e0efc277ea588519a934a36e4f49118a41c66c3519e07f872ed88a9c605671' 
  AND token = 'mNqQOeQWb0CQifU54CCHdDgqMV1IP4F915tA8reHXKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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