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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc3123ae08132ae3aa55a52e93b5ba3abf3c16374d3c25d595ed9168909eb59' 
  AND token = 'lezSFTHuVcFxUapZInMax9U8N3q5bDisxERcf6o5sKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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