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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4138dd0bdff9d862683acd7510c25bacf6b717d7d1bcde1b31c8539b9073eac7' 
  AND token = 'SHS4rwA7QkfIpyE7F/IuHqqtLWuJKkRNnV0uyoFCmTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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