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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472e5afbdc1f12b61bb859c18f8bd6453bee5af7621b744336ef6fd4d2dbd848' 
  AND token = '9EpBTcC8cO/74/hCrIJwD/X+ZuI9/ILLS/u1goqDkaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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