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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40bf10240db04b8ec20ddca8a3817e7b954e925266c05e6677aff752a82cbb5' 
  AND token = 'WgPlRatbPd6xGONXfZobK/gh+BrgQ3b/Bh6QccUHACc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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