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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae48e7eed6f2b6503689ee455e7ac7d1ebdeb928eab1a41c30431a1146b558b9' 
  AND token = 'EfecAQ7aVuqkZ9nLpoeKGE5RZ1Uw/u4QO38Ke3Wh4YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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