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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084fa700de55239bed1fc0c31b4f2b7f77097a284c2445913e8669bea1bb2922' 
  AND token = 'C4TUhQORcWBJ9i0au7spXMxaFueAoqKZao4N4pfpsr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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