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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6e1c4b9cd1aac646589876d2d1e033fedd8a10f31cf623e91331592489e90c' 
  AND token = 'wQcVHLAYToK2Q0rdcoLihH7EY9A0LePt3AajnfzcLCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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