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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3bd1c2bb822171806933202f5a8ce23bf7b98caa48b6087856defe35f53e5a' 
  AND token = '94Wx6r7QhPLSCPvr35JcsOz0xbPgo92G20FGfsRCcyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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