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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc1c770ca6a514a6f258e298c3b38f6d12f41fcbfbddaaaaccb643da280ca5a' 
  AND token = 'gthHOlbdCzxNeOvW2+LBchlrnu/613MhXAEUJ2S4mYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01741

JSON explain

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