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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da15508a99162244ebde8e113387eba2978bb917a6a228dafe858fc26a0a585f' 
  AND token = '5ag7SN7F/mu4RAQh4MUPK0J6FWn2/N3AW0NagH7biaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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