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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1db890f6b7459d2a74249c1d24b611c46fd04ff8ac4db2af23a8eefd2894406' 
  AND token = '2C2KJ2h5d+yjRIKkBaRx6kUA7Q5Wyb4DroqOvPdkjtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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