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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db743946c5f00963a9483df66aaea92028ab1777a6c4694827a81f9cf1d1bb8' 
  AND token = 'D3R6c/IeeJAA1Du7AbNcu/1B0oLuYFswOePN+dddmSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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