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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51766ff3882d6b318bf3cdcd67ad6963178d79c26701a67e1232df3a187f77e5' 
  AND token = 'weyH5eFG8E30Tobo/b/QmxxQDl3EH0bVZvw2513QmBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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