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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7c01153baf7efcdbad84824fd3e4c598b1aa32da2d06483a767f2828803d41' 
  AND token = 'D5refH/ACIEkcocSmLNKHlPN1psCSBIGKCCkbwMWuEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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