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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559064d61d315a6b7e2aaebb597d80642bada891f48c1e651b5d201c8c638ea0' 
  AND token = 'h2JD3BHupFGYT0nS53VF0o6wx99joWkEUyZLKN7Cuvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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