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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bfe6ccaa914158abce48b1a64ed6fd596f0bd3e11b77bf334afe57bb8a5fa06' 
  AND token = 'Y/z+romB7w9b4jhXdRne+mfVgpP689gG5J6l4xuT5rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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