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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c507cd67c8291f1c832081ad4767f327d625fb32178ed265031ff1208b07fa' 
  AND token = 'Ji+RMsw7CLCPsSRJz0kPEcxpvPxHTbUHyZdTZb/Wk60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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