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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '069ae52b3670ab3f406fb7fa5b817b5d8ee3bf6b80f775b80fa1528c0a1bb911' 
  AND token = 'v8zVZ5zEqd81VG5dnuLjv4tGo/MJZItOaiy9xeQYJ6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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