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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32a365d6ba756555cd8c3d227aa61e880176c37e5881784f1cc52c7ac7340aa' 
  AND token = 'lM1QdVJ/4BMjJDbdnWL+j3vCy+o6pWL/cK5rp8hccaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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