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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c03b06f4466251ed83884a8e295ba7f56e169368ec32f2db35916eee767fed11' 
  AND token = 'vkWsKDsR6lW+flt/6Qro4kqoZyI2hDxh/YQ8XxwZyDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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