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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f2409572fb856a8a1410d947c0ba0dd2fcf74984a2683edcee4eca7d9fb43c4' 
  AND token = 'swJgxaA598nLSTftn1TRaxLS2Of4zbnERWAy5cDloTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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