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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e6aeaf8ba171c399e84ebb196f7d8dc4fb5ede75ed85e1c9c9aac24a300b5e' 
  AND token = 'Pmt+I/I411VttbewIn4w6febf9sM5EKKSwVm8NPmFXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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